| 摘要 |
PURPOSE:To improve fuel consumption, in a hydraulic pressure feeder for a hydraulic suspension, by employing a variable delivery hydraulic pump and operating the hydraulic pump such that delivery of pressure oil per single rotation is higher when a vehicle is running than when the vehicle is stopped. CONSTITUTION:Vehicle speed is detected through a vehicle speed sensor 25 and inputted to a delivery control circuit 26. The delivery control circuit 26 compares the vehicle speed with a setting speed, and if the former is lower, a solenoid direction changeover valve 6 is driven to feed delivery oil pressure from a second hydraulic pump 3b through a drain piping 8 to a tank 9. Consequently, the second hydraulic pump 3b is operated with no load, and thereby line pressure and flow of an output side hydraulic piping 5 are ensured by a first hydraulic pump 3a having high delivery per single rotation. When the vehicle speed exceeds the setting level, the solenoid direction changeover valve 6 is stopped and delivery oil pressure from the second hydraulic pump 3b is fed to the piping 5 so as to increase flow to be consumed by a pressure control valve 12. By such arrangement, fuel consumption can be improved.
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